Train retarder



J. E. FINNESSY TRAIN RETARDER Sept. 4, 1928. 1,682,746

Filed Jan. 28, 1928 James LTI-11119555 by @WM his Homey Patented Sept. 4, 1928.

JAMES E. FINNESSY, OF PITTSBURGH, PENN SYLVANI.

TRAIN RETARDER.

Application filed January 28, 1928. Serial No. 250,154.

This invention relates to a shoe for use in trainretarders. s

Train retarders comprise a series of brakes mounted adjacent `railway tracks in railway yards. Such retarders are particularly advantageous in yards, as they obviate the necessity of coupling air lines or utilizingihand brakes While shifting cars. i A

A great problem in the use of train retarders has been the dili'iculty of providing a satisfactory brake shoe. Cast ironshoes crack and break under the conditions of their use, requiring frequent replacement. Even when rolled steel shoes are employed at the riskof cutting the wheels; they also frequently break in use. i

The objectof the invention is, tbereforeltto provide a brake shoe having a facing of `resilient material arranged to protect the metal backingmember from direct contactwith the carwheels, when the shoes of the train retarder are forcedagainst the Wheels of the car to check its movement. s s

A further object of the invention is to provi de a resilient facing which is relatively wear resisting, and which has an operating `face capable of creating a requisite degree of :triction when brought into contact with the wheels of a car. i

In the accompanyingdrawings Figure I is a plan view of the backing member or holder of the train retarder shoe constituting the subject matter of the present invention; Figure Il is a side elevation of the same; Figure III is a side elevation ofone form of facingr member; Figure IVl is aside elevation lof a fac ing member of modiiied structure; `Figure' V is a side elevation, showing' the facing member of Figure HI in position on a bac-king member; Figure VI is a plan view of such complete retarder shoe; Figure VHiis a side elevation, showing the facing member of Figure IV in position on a backing member; Figure VIII is a` plan view of such complete retarder shoe; Figure IX is a side elevation showing the facing member of Figure IV in I position on a backing member of modiied form; and Figure Xis a plan complete brake shoe.`

In the drawings the reference numeral l designates the longer sideflange of the backing member of the train retarder shoe, and

view of such reference numeral 2 the end flanges thereof. The side and end flanges are integral with a body7 member 3, which provides a seat for the resilient, wheel contacting member, of the shoe. This body 3 contains countersunkbolt holes fl for attachment of the backing member as a whole to the framemembersof the train retarder and comprises 'transversely extending lugs orribs for the attachment of the facing member of the shoe to the backing member. These ribs or lugs 5 are T-shaped, as shown, in order that they may` adequately en gage the facing member of the` shoe, in the manner to be` hereinafter described.

As shown, the body 3 is made integralwith Y the side flange l and end flanges 2 of the backing member. The backing member may, from the viewpoint of economy7 be `preferably made as an integral steel or iron casting. lVith the assembled shoe of the present invention it is not disadvantageous to cast the backing member, because it is fully protected fliom breakage by lthe facing member of the s oe.

The facing member 6 of the train retarder Y shoe is desirably of a` resilient composition,

and is supported by `the body, or seatmember. 3.

This facing member 6 may be made of rubber, with suitable friction creating material incorporated therein during vulcanization. For the purpose of creating the desired friction, frictional carbonaceous material7 or sand in relatively large quantities may desirably be incorporated inthe rubber, while steel filings or grindings may `also be incorporated I to further increase the wear resisting and friction producingproperties of the composition. If desired, asbestos sand, or granular asbestos may be used. This substance, in itself, serves to prevent burning out of the rubber facing` and also serves to increase the friction producing qualities of thefacing. `It should be `understood that the rubber itself used in the facing is desirably a commercial tire rubber, which` contains carbon black, and usually some smallquantity of Zinc oxide.

The composition facing member 6 is prou vided on its under face with suitable indentations for engaging with the lugs, or ribs, 5 on the body or seat member 3 of the backing member. These indentations are shown as transversely extending T-shaped Slots 7 to match the ribs of the backing member. When the facing member is brought into position on the body 3 and in Contact with t-he flanges Land QVtheslotsl 'tare caused .to engage thenibs mtoihold ther facingtmember 1n position.

In the form of trainletarder shoeshojvn in Figures IV, VII-and VIII' of the drawings,

the structure is identicalwith that Shownlinw Figures I, II, III, and V of the drawings with the exception of ,an ,additionto;thegenfacing member` 6,. .the inner surface ot fthe late` 8. may obviously `he.reughened toiassist 1`nthe, mutual e r1, 1;a,,1fement.` of the .plate and ifacingmember .during tulcanization .otthe atter. Y

'Wthtbmodied construction the plate V8 providesftheiace whichicomes 1into actual contact. .Withthencar; WheelmAs it is of a metal soften than the metal `of the wheel, there isno dangerof scuri `the Llatter. `As it is of relatively thic ness, in itself, it .Poe sesses .anappreciable resiliency; and es 1t .1S backed ,by the resilientmneanber 6, there 1s 4slight likelihood ofts breakage in use.

The furthet modiication shown inLFtgureS lXfand, X1 ofV the. drawings, isidentical with the structure shown in Figures IV, Vlllinnd ,.VIII, with .the exception .that an additional member is. added to the .-iassembly. This membcrcolnprees a. detachable .side plate `9 having therein bolt holes l() for the reception oztbolts llwhch Serve to attach `it to the-bod7 r3,.of .the backing` member. This sideplate 9 positively `prevents Shifting or dislodgement Otthafacingmember 6. ,While-.thismodi-- 4titration Tisshown as appledtofthe Structure .0:frFignresIV, VILand VIII, it should be Mnderood thatlit ieequally applicable to thestructaresshcwnin Figures L II, III, V, and VIsof. the dtawltgs- .Thetran retardershoe et the .present invention, presenteren eeen@myA inicontinued usqbecause the membersthereof which come into contact Witha car wheelare ,dunablend therefore ,require Y, infrequent replacement.

f lllhebacking member, since it ismot subjected to ,blowscaused by, idirect `contact "with car wheels .may beeconomicalvly manufactured by cast-lng iw relatwelv 2 inexpenslve anaal.` .As

`previously stated, theretarderf sbeealso. cb-

i viateaany pessibiltywcf scnringfcac wheels uponlvahoh .it acts. lVhatfI claim is: .Lilli a train atarderehoegaanetialllc backingmember comprising.aibodyfhavingza seating face and side and end flanges, lugs on said seating face and a facing ot a rubberoid material having in the under region thereof indentations arranged to engage the lugs on the seatingace of the body.

\ 2. Artrain retarder shoeicomprising an in- --tegra-Lmetallic backing member having a seating face. and cooperatingflanges, headed rlbs extending transverseltY of the seat, and a fac ingmf a rubberoid material having in the under region thereof grooves formef and arnanged tojeugagegthe ribs on the frame member.

3.t A :train retarden `islnoe ummprising a metallic backing member having seating face, lugsfon` saidseating face, aifacimg'of rubberoid` material fhaiving in i thevunder- .region. thereofi indentatinns arranged to engage the lugson the uppereplmtefof the "frame, and a covenimg inem ber tot .a :metal l. softer` :than chilled steel attacheditoeaid lmbherfacing.

41 Avtrain retarder shoe eomprisiugn integral metallicfbacking membemhavin aseat ing face and associatedulangeswhe edsribs extending tnansverselyvof `the meat, `a :facing ofc mibberoidumaterial .hmvingin' the f under region thereof grooves `teamedand.A arranged to engage the ribsI onthenwmemember, mid a covering member of a metal `softer than l chilled steel atttached to said rubber facing.

5: A train.. retarderf'hoe comprising `a `metallici backing member having la seating facelandassociatedian es,1u saonlsaideeating face, axafacing ofirub roi 'matenialhaving-iin the under negionitbereof indentations arranged to engage the lugs on the seating face, and `detachable side meinberarranged tobe attached to the remainder-oftalle-backen memberlaftery attaohmentfoff the rarbberei facing. l

1 6. `A train retardenshoecomprisin-g ali-integral metallic frame member-havinga seating face andangee associated -tlierewithgribs extending transverselylof the seat, a facing of 'rubberoid-Fmateriali having intheA under region thereof grooves lharmed and arranged Y toengage the rib/son the frame membeQ-and a detachable sidegmemberarrgngedtofbe attached to the remainder of thebod lmember atter attachment of therubberoid cing.

7. A` train retarderhoe comprising a metallic body member having a lseating face and associated flanges, lugs `on the `seating facea ifacingof rubbe'roid hmaterial having in the under `region thereof indentationsarranged to engage the lugs on the Aripper plate of the frame, acoveringmem-ben of a metal softer than chilled steel attached to saidrubber facing, andra detachable side member, 8. A .trainvafetacder shoe- Vcomprising metallic body-memben having a seating face, a facing of rubberoid material, and-means forY attaching` said lruhberoid `facing to the seat of the metallic body member.

9; A: t-rainaetarder `shoe `cornvrising :t

metallic body member having a seating face,

a facing of rubherod material, means for attaohing said rubberoid facing to the seat of the metallic body member, and a covering 15 member of a metal softer than chlledvsteel attached to said rnbberod facing.

10. A train retarder shoe comprising a mecovering member of a metal softer than W chilled steel attached to said yielding means; In Witness whereof I hereunto set my hand.

JAMES E. FINNESSY. 

